// Ninf-G-XX, ver. 0.1
// Copyright 2011 National Institute of Advanced Industrial Science and Technology
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdio.h>
#include <stdlib.h>
#define M 10000

#ifdef __linux__
#define RANDOM_MAX RAND_MAX
#else
#define RANDOM_MAX 2147483647 /* 2**31 - 1 */
#endif

double pi_trial(int seed, int times){
  double ratioSum = 0.0;
  srandom(seed);

  for (int l = 0; l < times; l++){
    int counter = 0;
    for (int i = 0; i < M; i++){
      double x = (double)random() /	RANDOM_MAX;
      double y = (double)random() /	RANDOM_MAX;
      if (x * x + y * y < 1.0)
	counter++;
    }
    ratioSum += (counter / (double)M);
    printf("ratioSum = %f\n", ratioSum);
  }
  return ratioSum / times;
}
